Do I Have to Have the Xbox 360 Wireless Networking Adapter I Dont want to Have to pay 100$ for one and Instead of a router can I use My Labtop????

I got the core system and I want to know what do I use to get my 360 system connected to Xbox live??;)

Can A Original Xbox Network Adapter work with a Xbox 360?? I Dont Want to spend 100$ on one for the Xbox 360, And Instead Of using a Router can I use my Labtop to connect to Xbox Live

??? 

Can A Xbox Ethernet cable work with a 360??

I cant Choose from DefJam Icon, NBA Homecourt, Call of Duty 3, or Crackdown??

I am using a wifi key for the psp to get me online Instead of a router. when I try It finds the access point then something pops ip address timed out. Even though I have a 100% signal

Will this kind of router get my psp online   http://www.compusa.com/products/product_info.asp?product_code=316833&pfp=search&tabtype=rv#moreinfo